Cooperite

Formula: (Pt,Pd,Ni)S

Reflected/transmitted colour: brown

Pleochroism: from white to creamy white with bluish tint

Optical isotropy/anisotropy: strong anisotropy, greenish gray to whitish yellow to brown-gray and brown

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Creamy-grayish fractured grains of cherepanovite with gray granular cooperite, white massive grains of iridian ruthenian platinum and white crystals of iridian ruthenian osmium. Polished section in reflected light
Origin: Placer Deposit, Northern Pekul'nei River, Pekul'nei Range, Chukotka (Tchukotka) Okrug, Chukot Peninsula, Far-Eastern Region, Russia
Picture size: 0.12 mm
Owner: Thomas Witzke

 

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